Righteous Side of the Wicked by Jennifer Bray Weber

A spy on the run …
Treva MacDougall is running for her life. Not just hers, but those of her clansmen. Fleeing the hangman’s noose, she must reach her rebel cousin in Scotland in time to warn him of an ambush by the Crown. Finagling her way aboard a pirate ship running contraband wasn’t difficult, but ignoring the intense temptation she feels toward the ship’s captain is verra difficult. She can’t allow herself to have feelings for any man, but maybe just one night of sinful pleasure…

A pirate caught in the middle
Coire Fletcher doesn’t trust women. None of them, but especially the dark haired, moss-eyed lass whose pretty lies got her onto his ship and her sharp wit and undying spirit is getting under his skin. He knows she’s lying—after all, she is a female—but by damned his growing attraction to her is as troubling as a Caribbean hurricane. He won’t be fooled again by a woman, not even one he can’t stop thinking about. He’ll deliver his smuggled goods and Treva at the next port, then sail away. Or so he thinks…

Chased by the British Navy and vengeful enemy pirates alike, Coire and Treva must leave past injustices behind and learn to trust each other…or neither may see another sunrise.